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Frequently Asked Questions  
  1. What pollutants do CleanWay® stormwater filtration systems remove?
  2. How long do filtration inserts last?
  3. How do you know when it's time to change the filter?
  4. What type of maintenance is needed?
  5. How do I remove specific pollutants—what options do I have?
  6. Do I need regulatory approval to use CleanWay products?
  7. How can I tell if the filter is working correctly?
  8. How do I know if I need a custom or standard product?
  9. Do you also provide maintenance for your systems once installed?
  10. How often does the Adsorb-it Filtration Fabric element need to be replaced in a typical parking lot application?
CleanWay
MetalZorb Frequently Asked Questions MetalZorb
  1. How long does the metals removal media last?
  2. Can you give an example of how long it lasts?
  3. How do I dispose of the spent media?
  4. What is the difference between MetalZorb and FORAGER® Sponge?
  5. Can MetalZorb handle both high flow and low flow applications?
  6. For in situ applications, can you swap out the spent sponge product?
  7. How does it work?
  8. Why do you call MetalZorb "The Gold Standard in Metals Removal?"
  9. Can you use MetalZorb sponge product in remote applications?
  10. What metals does MetalZorb sponge product absorb?
  11. How do I know which MetalZorb media blend to choose?
  12. Will this product work in my existing filter vault system?
  13. What are the general chemical properties of MetalZorb?
  14. In what order does MetalZorb absorb various metallic ions?
  15. Do you have a capacity calculator that will help understand its use in my application?
  16. Are there disposal considerations?
CleanWay

What pollutants do CleanWay® stormwater filtration systems remove?

CleanWay systems are designed to remove stormwater pollutants ranging from small particulates to trash and debris, depending on the configuration. Our filter media captures total suspended solids (TSS), sediment, oil sheen, heavy metals and more.

How long do filtration inserts last?

As a general guideline, the filter element must be replaced annually. More frequent element changes are dictated by site conditions. The cleaner the site, the longer the service life between maintenance cycles.

How do you know when it’s time to change the filter?

Monthly inspections, which are required for most permit holders, provide visual clues. It’s time for maintenance:

  • when the rigid strainer insert is dirty and debris has accumulated in the strainer
  • when the water level in the strainer rises above normal levels—which is seen during rain events
  • when water samples taken from the unit show water quality decay or degradation

What type of maintenance is needed?

First, the grate is removed to access the catch basin. Second, the rigid strainer is easily accessible and can be removed by hand, then emptied in an approved receptacle. Third, to perform maintenance on the filter element, a vactor truck, vacuum truck street sweeper or large shop vac can all be used to remove accumulated pollutants and debris.

How do I remove specific pollutants—what options do I have?

We offer a variety of filter elements and adsorption media to meet your site-specific requirements. Along with standard configurations, we provide special sizes and configurations according to your specifications. Contact us to learn more or provide a quote.

Do I need regulatory approval to use CleanWay products?

Because all of our products are intended for use as retrofit or as part of a larger treatment system, approvals are not required. However, we recommend that you check with your local regulatory entity for any special considerations.

How can I tell if the filter is working correctly?

CleanWay catch basin inserts and downspout filtration systems all feature our proprietary sampling port. The sampling port is large enough to introduce a typical sampling bottle and is readily accessible and easy to use. Simply take a sample with a dip stick with cup and view or analyze the contents.

How do I know if I need a custom or standard product?

Because of the wide variety of inlet sizes and shapes in use, we have developed a diverse inventory of standard products to fit most applications. Just give us a call or complete the Filter Sizing Guide and we can quickly determine whether one of our off the shelf standard products will fit your site.

Do you also provide maintenance for your systems once installed?

We offer maintenance through our Partnership Program, working with various service providers to maintain your systems on regular intervals. Contact us for a service provider in your area.

Or, your current stormwater facility maintenance provider can also perform the required services.

How often does the Adsorb-it Filtration Fabric element need to be replaced in a typical parking lot application?

CleanWay Adsorb-it Filtration Fabric sorbent products remove oil, oil sheen, and suspended solids from water. We recommend installation of new Filtration Fabric elements at the start their rainy season. For example, say we install a new element in the northwest on or around the first of October. Once the leaves have fallen from the trees—around the end of November—we replace the element again. This second element may last through the remainder of the winter rainy season. That depends heavily on the condition of the pavement, the volume and type of traffic, the area of pavement that the filter serves and the weather conditions. To perform at its best, the filter element should be replaced regularly if it is exposed to oily grit.

If neglected, the filter will become clogged and water will start to flow out the bypass. No treatment of this bypass water will be achieved. Simple visual inspection of the filters on a monthly basis is all that is usually required to determine if the element needs to be replaced.

Filtration Fabric elements are very inexpensive and simple to replace. We encourage people to replace the element at the first indication that it is starting to become clogged.

CleanWay

MetalZorb FAQ

How long does the metals removal media last?

The duration of treatment and operational lifetime depend upon several factors such as:

  • unit size
  • cumulative flow volume
  • concentration of pollutants of concern
  • absorption efficiency of the unit within a specific treatment system
  • desired removal efficiency
  • consistency of slurry
  • average size of suspended particles

Can you give an example of how long it lasts?

One cubic foot of Type M sponge product can hold about 190 grams of lead at saturation. If the water to be treated contains 1 ppm of lead, the unit is achieving 100% lead removal and not absorbing anything else, one cubic foot of sponge can treat 50,000 or more gallons of water. At an average flow rate of 1000 gal/week, one cubic foot will last almost a year.

How do I dispose of the spent media?

MetalZorb can easily be disposed of as solid waste. It's non-toxic, bio-degradable, and non-hazardous prior to use, and does not contain materials that require special handling or pose any threat to human health or the environment. After the sponge has absorbed metal ions, metal is bound to the sponge and will not be released without special chemical treatment. The metals are now in a solid waste form.
  1. CleanWay recommends that used sponge be disposed of at an approved solid waste disposal facility. Disposal regulations vary by state and by facility. Consult your local waste disposal authority for details
  2. Saturated sponge may be disposed of by compaction. If the sponge has been exposed to potentially toxic metals (mercury or lead), analysis may be needed.
  3. Used sponge can be blended into feed stock at plywood factory.
  4. While certain metals (i.e. copper) will alter the color of the sponge, others will not present a visual indicator of media saturation. Periodic analysis of effluent will be required to determine when sponge should be replaced.

What is the difference between MetalZorb and FORAGER® Sponge?

MetalZorb is available exclusively from CleanWay® Environmental Partners through a license agreement and was originally developed under the name FORAGER® Sponge.

The remediation of ground water using FORAGER® Sponge is described in EPA Superfund Innovative Technology Evaluation Report EPA/540/R-94/522.

Can MetalZorb handle both high flow and low flow applications?

MetalZorb sponge provides the ideal technology for reducing and absorbing heavy metals and metallic ions from both high and low flow applications, including industrial effluents, landfill leachates, stormwater runoff, and any type of non-point source pollution where unattended gravity flow occurs.

For in situ applications, can you swap out the spent sponge product?

Effective ground water remediation can be achieved by vertically positioning fishnet bags filled with MetalZorb at the gate of a barrier wall funnel system. Units filled with sponge product can be periodically retrieved and replaced with fresh sponge to ensure continuous effective metals removal.

How does it work?

MetalZorb is a highly effective sponge product that consists of a multitude of highly absorbent half inch cubes, combined together in various configurations to address metals removal at any site.

The sponge pores are self-filtering to prevent total occlusion of the active polymer component.

Why do you call MetalZorb "The Gold Standard in Metals Removal?"

This patented sponge product provides the ideal technology for reducing and absorbing heavy metals and metallic ions from both high and low flow applications. Applications for this product are expansive—and include industrial effluents, landfill leachates, stormwater runoff, and any type of non-point source pollution where unattended gravity flow occurs.

Can you use MetalZorb sponge product in remote applications?

This sponge product works well when installed in remote or unattended locations for effective absorption that can be monitored effectively by radio-transmitting sensors.

What metals does MetalZorb sponge product absorb?

This highly effective sponge product targets heavy metals such as zinc, copper, lead, and other heavy metals commonly found in stormwater and industrial process water discharge.

MetalZorb features high ion absorption capabilities and quick, aggressive kinetics to capture dissolved metals which are then held in the media so they won't leach out.

How do I know which MetalZorb media blend to choose?

We work with you to determine the right media blend for each installation, to ensure that the solution addresses your site-specific water quality requirements.

Will this product work in my existing filter vault system?

This sponge product can be used in existing filter vaults, catch basins—and even downspout filtration units by simply replacing the filtration system's current media.

What are the general chemical properties of MetalZorb?

MetalZorb is a specially treated sponge product designed specifically for the removal of heavy metal contaminants. To learn about the general chemical properties and technical applications, refer to the Metal Removal Properties information.

In what order does MetalZorb absorb various metallic ions?

The order of affinity of the polymer for metals is influenced by solution parameters such as pH, temperature, and total ionic content. The affinity sequence for several representative ions is generally expected as noted in the Metals Removal Order of Affinity.

Do you have a capacity calculator that will help understand its use in my application?

The MetalZorb Treated Sponge Product Capacity Calculator provides the equation for calculating the sponge capacity.

Are there disposal considerations?

MetalZorb is non-toxic, bio-degradable, and non-hazardous prior to use, and does not contain materials that require special handling or pose any threat to human health or the environment. After the sponge has absorbed metal ions, metal is bound to the sponge and will not be released without special chemical treatment. The metals are now in a solid waste form.

  1. CleanWay recommends that used sponge be disposed of at an approved solid waste disposal facility. Disposal regulations vary by state and by facility. Consult your local waste disposal authority for details.
  2. Saturated sponge may be disposed of by compaction. If the sponge has been exposed to potentially toxic metals (mercury or lead), analysis may be needed.
  3. Used sponge can be blended into feed stock at plywood factory.
  4. While certain metals (i.e. copper) will alter the color of the sponge, others will not present a visual indicator of media saturation. Periodic analysis of effluent will be required to determine when sponge should be replaced.

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